As an example of using this service, calling the API using the word "president," returns a list of terms like "President of the United States," "Chief Executive," "chairperson," "head of state," etc. The following shows how this call is made:

The REST-based API and can return data in one of four formats: JSON, XML, serialized PHP array, or plain text.

There are actually two API versions. The Version 1 API returns a list of related words and phrases. The richer Version 2 API provides the part of speech (noun, verb, adjective, etc.), and categorizes the relationship between each returned word or phrase and the search word. The relationship types are synonym, antonym, related term, similar term, and user suggestions.